A single socket, single core, single thread system has __max_smt_threads
set to 0 since smp_callin() is not called.
__max_smt_threads must be a minimum of 1.
Fixes: b1cbacc8663a ("x86/smpboot: Do not use smp_num_siblings in
__max_logical_packages calculation)
Signed-off-by: Prarit Bhargava <[email protected]>
Cc: Jakub Kicinski <[email protected]>
Cc: [email protected]
Cc: "[email protected]"
Cc: Clark Williams <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: [email protected]
Cc: Thomas Gleixner <[email protected]>
Link: https://marc.info/?t=151246092100004&r=1&w=2
---
arch/x86/kernel/smpboot.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index eaee15fb7d8b..882c61e1d7a2 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -106,7 +106,7 @@ EXPORT_SYMBOL(__max_logical_packages);
static unsigned int logical_packages __read_mostly;
/* Maximum number of SMT threads on any online core */
-int __max_smt_threads __read_mostly;
+int __read_mostly __max_smt_threads = 1;
/* Flag to indicate if a complete sched domain rebuild is required */
bool x86_topology_update;
--
2.15.0.rc0.39.g2f0e14e64
